EP3822010A1 - Outil d'usinage et de perçage à serrage stable - Google Patents

Outil d'usinage et de perçage à serrage stable Download PDF

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Publication number
EP3822010A1
EP3822010A1 EP19880451.0A EP19880451A EP3822010A1 EP 3822010 A1 EP3822010 A1 EP 3822010A1 EP 19880451 A EP19880451 A EP 19880451A EP 3822010 A1 EP3822010 A1 EP 3822010A1
Authority
EP
European Patent Office
Prior art keywords
recess
clamping
peripheral surface
central axis
cutting part
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP19880451.0A
Other languages
German (de)
English (en)
Other versions
EP3822010A4 (fr
Inventor
Aisheng JIANG
Shequan Wang
Ping Li
Min Liu
Xingdong XIANG
Zhiwei Zhao
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhuzhou Cemented Carbide Cutting Tools Co Ltd
Original Assignee
Zhuzhou Cemented Carbide Cutting Tools Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhuzhou Cemented Carbide Cutting Tools Co Ltd filed Critical Zhuzhou Cemented Carbide Cutting Tools Co Ltd
Publication of EP3822010A1 publication Critical patent/EP3822010A1/fr
Publication of EP3822010A4 publication Critical patent/EP3822010A4/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/11—Retention by threaded connection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/0002—Drills with connected cutting heads, e.g. with non-exchangeable cutting heads; Drills with a single insert extending across the rotational axis and having at least two radially extending cutting edges in the working position
    • B23B51/0003—Drills with connected cutting heads, e.g. with non-exchangeable cutting heads; Drills with a single insert extending across the rotational axis and having at least two radially extending cutting edges in the working position with exchangeable heads or inserts
    • B23B51/0004—Drills with connected cutting heads, e.g. with non-exchangeable cutting heads; Drills with a single insert extending across the rotational axis and having at least two radially extending cutting edges in the working position with exchangeable heads or inserts with cutting heads or inserts attached by screw means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/02—Twist drills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/02—Connections between shanks and removable cutting heads

Definitions

  • the present invention relates to the field of drilling tool, in particular to a drilling tool with stable clamping.
  • cemented carbide or similar materials are usually used as tool materials. Such materials have high hardness, good wear resistance and considerable difficulty in machining, resulting in high material cost and machining cost of drilling tools.
  • commonly used drilling tools are generally composed of cutting parts and clamping parts.
  • the cutting parts are made of cemented carbide or similar materials with high hardness and good wear resistance, while the clamping parts are made of elastic materials. When the cutting parts are worn out, the cutting parts can be replaced separately, which can reduce drilling cost.
  • drilling tools have poor locating accuracy, liability to fall off and short service life.
  • CN102015001011474 discloses a drilling tool, recess and protrusion fit is essentially clearance interference fit of form of thread, and in the process of twisting, clearance fit occurs earlier than interference fit, and finally the clearance fit occurs again.
  • a negative clearance refers to an interference amount.
  • thread interference clamping although the thread interference clamping can be realized, it is difficult to accurately control interference size of pitch diameter of thread. At the same time, the thread interference occurs on both sides of the form of thread, resulting in small contact area, poor circumferential centering ability of a tool bit, and complete contact with an axial locating surface. During batch installation, it is hard to guarantee axial and circumferential runout accuracy of the tool bit, and the thread interference can only be used in clamping instead of centering.
  • the present invention provides a drilling tool that has advantages of stable clamping, fast assembly and disassembly, no axial looseness, high locating accuracy and effective prevention of falling off of cutting parts.
  • the present invention adopts the following technical solution.
  • a drilling tool with stable clamping comprises a cutting part and a clamping part.
  • the cutting part comprises a cutting portion and a connecting portion connected to a lower end of the cutting portion.
  • the connecting portion is provided with multiple accommodating grooves penetrating the cutting portion.
  • the connecting portion is provided with an outer peripheral surface between the adjacent accommodating grooves.
  • An axial locating surface for axial locating is provided at a connection between the cutting portion and the connecting portion.
  • the clamping part comprises a shank portion and a clamping portion located at a front end of the shank portion.
  • the clamping portion is provided with spiral grooves corresponding to the cuttings accommodating groove and extending to the shank portion.
  • the clamping portion is provided with an inner peripheral surface for clamping the outer peripheral surface between the adjacent spiral grooves.
  • a front end of the clamping portion is provided with an axial surface corresponding to the axial locating surface.
  • the axial locating surface is in contact with the axial surface.
  • a middle portion of the outer peripheral surface and a middle portion of the inner peripheral surface are respectively provided with a recess and a protrusion which are engaged with each other.
  • the recess is spirally twisted into the protruding in a direction of a central axis.
  • the recess is composed of two recess side surfaces and a recess bottom surface connected between the recess side surfaces. Each of the recess side surfaces is provided with an inner recess side surface at an end close to the recess bottom surface.
  • the recess is composed of two protruding side surfaces and a protruding top surface connected between the two protruding side surfaces. Each of the protruding side surfaces is provided with an inner protruding side surface on a side close to the inner peripheral surface.
  • a clearance between the axial locating surface and the axial surface is ⁇ 1
  • a clearance between the inner recess side surface at a side close to the axial locating surface and the inner protruding side surface at a side close to the axial surface is ⁇ 3, which meets the following requirement: 0mm ⁇ 3 ⁇ 0.1mm.
  • the cutting portion is provided with a torque transmitting surface for circumferential locating
  • the clamping portion is provided with a circumferential surface for circumferential locating
  • the torque transmitting surface is in contact with the circumferential surface.
  • the connecting portion is provided with a bottom end surface which is perpendicular to the central axis on a side away from the cutting portion.
  • An inclined notch is arranged between the recess and the bottom end surface.
  • the clamping portion is provided with a groove bottom surface perpendicular to the central axis in a direction of a side close to the shank portion.
  • a tail bump corresponding to the inclined notch is arranged between the protrusion and the groove bottom surface.
  • a lead angle of the recess of the cutting part is ⁇ , which meets the following requirement: 8° ⁇ 12°.
  • the recess side surface comprises a top recess side surface, and the top recess side surface is arranged close to the outer peripheral surface.
  • Each of the recess side surfaces comprises a top protruding side surface, and the top protruding side surface is arranged close to the protruding top surface.
  • the recess side surface also comprises an inner recess side surface, and the inner recess side surface is located between the top recess side surface and the recess bottom surface.
  • the protruding side surface comprises an inner protruding side surface, and the inner protruding side surface is located between the top protruding side surface and the protruding top surface.
  • a diameter of the outer peripheral surface of the cutting part is D
  • a radial depth of the inner recess side surface is L
  • a radial depth of the top recess side surface is L1
  • a radial depth of the inner protruding side surface is L'
  • a radial depth of the top protruding side surface is L1', which meets the following requirements: 0.02D ⁇ L, L' ⁇ 0.15D, 0.003D ⁇ L1, and L1' ⁇ 0.01D.
  • a distance from a projection line of the outer peripheral surface to the central axis is constant.
  • a variation in distance from a projection line of the inner peripheral surface to the central axis is ⁇ R, which meets the following requirements: 0 ⁇ R ⁇ 0.04mm.
  • a maximum circumferential twisting angle between the recess and the protrusion is ⁇ , which meets the following requirement: 70° ⁇ 130°.
  • a distance R from the projection line of the inner peripheral surface to the central axis has a minimum value in the plane passing through the central axis.
  • a distance R from the projection line of the inner peripheral surface to the central axis is constant.
  • a variation in distance from the projection line of the outer peripheral surface to the central axis is ⁇ R', which meets the following requirement: 0 ⁇ R' ⁇ 0.04mm.
  • the maximum circumferential twisting angle between the recess and the protrusion is ⁇ , which meets the following requirement: 70° ⁇ 130°.
  • a distance R' from the projection line of the inner peripheral surface to the central axis has a maximum value in the plane passing through the central axis.
  • the present invention has the following advantages:
  • the recess of the cutting part is spirally twisted into the protrusion of the clamping part, and interference fit occurs between the outer peripheral surface of the cutting part and the inner peripheral surface of the clamping part.
  • the fit between the outer peripheral surface and the inner peripheral surface essentially refers to clearance interference fit between an inner hole wall and an outer cylinder. In the process of twisting, clearance fit occurs earlier than the interference fit, and finally the clearance fit occurs again.
  • the inner hole and the outer cylinder can be used in clamping and accurately centering, which can improve assembly accuracy, and reduce manufacturing difficulty of the recess and the protrusion.
  • the clamping parts can not only quickly and conveniently complete clamping of the cutting part, but also effectively prevent the cutting part from loosening around the central axis.
  • the clearance between the axial locating surface and the axial surface is ⁇ 1
  • the clamping part and the cutting part clamp the cutting part up and down simultaneously without any clearance on the axial locating surface and the inner recess side surface, so that the cutting part can be positioned accurately in the direction of the central axis and will not come loose in the direction of the central axis in the cutting process, which improves cutting stability.
  • the cutting part and the clamping part are respectively provided with a torque transmitting surface and a circumferential surface for transmitting circumferential load.
  • the clearance between the torque transmitting surface and the circumferential surface is ⁇ 4, with 0mm ⁇ 4 ⁇ 0.05mm.
  • the clamping part forms over-locating clamping to the cutting part, resulting in good locating strength, accuracy and impact resistance.
  • Precise and accurate design of the clearance ⁇ 4 between the torque transmitting surface and the circumferential surface can not only effectively reduce manufacturing difficulty of an over-locating structure, but also use axial micro deformation of the protrusion (generally less than 0.004mm) to increase contact area between the recess and the protrusion and realize the complete contact between the torque transmitting surface and the circumferential surface, thus improving the clamping stability and clamping repeatability of the cutting part, reducing cutting vibration and improving surface quality of the hole while greatly improving the service life of cutting part.
  • the top protruding side surface is not in contact with the recess, and the top recess side surface is not in contact with the protrusion, so that the protrusion can only be in contact with the inner recess side surface, which can maximize effective contact length and contact strength of the recess and the protrusion, prevent the cutting part from falling off from the clamping part, and improve stress capacity of an interface, thus prolonging the service life of the cutting part.
  • the drilling tool with stable clamping of the present invention by precisely designing the lead angle ⁇ at which the recess of the cutting part is spirally twisted into the protrusion of the clamping part and the clearance ⁇ 4 between the torque transmitting surface and the circumferential surface, even if manufacturing tolerance of the cutting part is inevitable, when the cutting parts are assembled interchangeably in batches, the axial locating surface, the inner recess side surface and the torque transmitting surface of the cutting part are still in full contact with the clamping part, which greatly ensures interchangeability and performance stability of different cutting parts.
  • FIG. 1 to FIG. 12 show an embodiment of a drilling tool with stable clamping of the present invention.
  • the drilling tool with stable clamping comprises a cutting part 1 and a clamping part 2, and the cutting part 1 and the clamping part 2 are symmetrical with respect to a central axis 24.
  • the cutting part 1 comprises a cutting portion 11 and a connecting portion 12 connected to a lower end of the cutting portion 11, and the clamping part 2 comprises a shank portion 22 and two clamping portions 21 at a front end of the shank portion 22.
  • the cutting portion 11 of the cutting part 1 is provided with two cutting edges, and the connecting portion 12 is provided with multiple accommodating grooves 14 penetrating the cutting portion 11.
  • the connecting portion 12 is provided with an outer peripheral surface 13 between the adjacent accommodating grooves 14, the clamping portion 21 is provided with spiral grooves 25 corresponding to the cuttings accommodating groove 14 and extending to the shank portion 22, and the clamping portion 21 is provided with an inner peripheral surface 23 for clamping the outer peripheral surface 13 between the adjacent spiral grooves 25.
  • Middle portions and bottoms of the outer peripheral surface 13 are respectively provided with a recess 3 and an inclined notch 5, and middle portions and bottoms of the inner peripheral surface 23 are respectively provided with a protrusion 4 and a tail bump 6.
  • An axial locating surface 112 is provided at a junction between the cutting portion 11 and the connecting portion 12, the clamping portion 21 is provided with an axial surface 212 corresponding to the axial locating surface 112, and a clearance is arranged between a bottom end surface 121 of the connecting portion 12 of the cutting part 1 and a groove bottom surface 213 of the clamping portion 21 of the clamping part 2.
  • the recess 3 spirally rotates around the central axis 24 of the clamping part 2 to accommodate the protrusion 4 to engagement to achieve complete clamping of the cutting part 1 on the clamping part 2.
  • the outer peripheral surface 13 and the inner peripheral surface 23 match with a varying interference amount ⁇ in the complete clamping process, which should meet the following requirement: -0.1mm ⁇ 0.05mm.
  • the clamping process is clearance fit ⁇ clearance decrease ⁇ interference fit ⁇ interference increase ⁇ maximum interference ⁇ clearance fit.
  • a change rule of the interference amount ⁇ is from the minimum value ⁇ min (-0.1mm) to the maximum value ⁇ max (0.05mm). After the complete clamping, the interference amount ⁇ returns to the minimum value ⁇ min .
  • the interference amount ⁇ of the clamping part changes in a range of -0.05mm and 0.03mm in the process from the clearance to the interference.
  • the interference amount ⁇ is -0.1mm (at this time, the clamping part 2 and the cutting part 1 are in clearance fit), and then the interference amount ⁇ gradually increases to 0.05mm.
  • a bottom recess 215 is provided on the groove bottom surface 213 of the clamping portion 21 of the clamping part 2.
  • a front end of the cutting portion 11 is provided with a cutting surface 111
  • a rear end of the connecting portion 12 is provided with a bottom end surface 121
  • an axial locating surface 112 for axial locating is provided at a junction between the cutting portion 11 and the connecting portion 12.
  • the two clamping parts 21 are arranged opposite to each other along the central axis 24, a middle portion thereof is provided with a mounting groove, a front end of the clamping portion 21 is provided with a groove top surface 211, and a rear end of the mounting groove is provided with a groove bottom surface 213.
  • a torque transmitting surface 113 for circumferential locating is arranged between the cutting surface 111 and the locating surface 112, and the clamping portion 21 is provided with a circumferential surface 214 corresponding to the torque transmitting surface 113 between the groove top surface 211 and the axial surface 212.
  • the recess 3 in the middle of the outer peripheral surface 13 of the connecting portion 12 of the cutting part 1 is composed of two recess side surfaces 31 and one recess bottom surface 32.
  • Each of the recess side surfaces 31 is composed of an inner recess side surface 311 and a top recess side surface 312.
  • the inner recess side surface 311 is arranged close to the recess bottom surface 32, and the top recess side surface 312 is arranged close to the outer peripheral surface 13.
  • the protrusion 4 in the middle of the inner peripheral surface 23 of the clamping portion 21 is composed of two protruding side surfaces 41 and a protruding top surface 42.
  • Each of the protruding side surfaces 41 is composed of an inner protruding side surface 411 and a top protruding side surface 412, the inner protruding side surface 411 is arranged close to the inner peripheral surface 23, and the top protruding side surface 412 is arranged close to the protruding top surface 42.
  • an included angle between the two top recess side surfaces 312 on the recess 3 is greater than that between the two inner recess side surfaces 311
  • an included angle between the two top protruding side surfaces 412 on the protrusion 4 is greater than that between the corresponding two inner protruding side surfaces 411
  • the included angle between the two inner recess side surfaces 311 is essentially equal to that between the two inner protruding side surfaces 411.
  • a clearance between the axial locating surface 112 and the axial surface 212 is ⁇ 1
  • the inner recess side surface 311 on the side away from the axial locating surface 112 is in contact with the inner protruding side surface 411 on the side away from the axial surface 212, and the axial locating surface 112 is in contact with the axial surface 212.
  • an inclined notch 5 is arranged between the recess 3 of the cutting portion 11 and the bottom end surface 121, the clamping portion 21 is provided with a tail bump 6 corresponding to the inclined notch5, and the tail bump 6 is arranged between the protrusion 4 and the groove bottom surface 213.
  • the inclined notch 5 is composed of one inclined side surface 51 and one inclined bottom surface 52
  • the tail bump 6 is composed of a tail side surface 61 and a tail top surface 62
  • the inclined side surface 51 is not in contact with the inner tail side surface 61
  • a clearance between the inner recess side surface 311 on the side close to the axial locating surface 112 and the inner protruding side surface 411 on the side close to the axial surface 212 is ⁇ 3, which should meet the following requirement: 0mm ⁇ 3 ⁇ 0.03mm.
  • a lead angle of the recess side surface 31 of the cutting part 1 is ⁇ in the direction of the central axis 24, which should meet the following requirement: 8° ⁇ 12°.
  • a clearance between the torque transmitting surface 113 and the circumferential surface 214 is ⁇ 4, which should meet the following requirement: 0mm ⁇ 4 ⁇ 0.05mm.
  • the inner protruding side surface 411 on the side close to the axial surface 212 is in fit with the inner recess side surface 311 on the side close to the axial locating surface 112, while the top protruding side surface 412 is not in contact with the inner recess side surface 311 of the recess 3.
  • a clearance between the inclined notch 5 and the tail bump 6 is ⁇ 5, which should meet the following requirement: 0.02mm ⁇ 5 ⁇ 0.1mm.
  • the recess bottom surface 32 is not in contact with the protruding top surface 42.
  • a distance from a projection line of the outer peripheral surface 13 to the central axis 24 is constant.
  • a distance R' from a projection line of the inner peripheral surface 23 on the connecting portion 12 of the cutting part 1 to the central axis 24 changes linearly with the increase of a twisting angle with variation being ⁇ R', which should meet the following requirement: 0 ⁇ R' ⁇ 0.04mm.
  • ⁇ R 0.025mm.
  • the top protruding side surface 412 is not in contact with the recess 3, and the top recess side surface 312 is not in contact with the protrusion 4.
  • a diameter of the outer peripheral surface 13 of the cutting part 1 is D
  • a radial depth of the inner recess side surface 311 is L
  • a radial depth of the top recess side surface 312 is L1
  • a radial depth of the inner protruding side surface 411 is L'
  • a radial depth of the top protruding side surface 412 is L1', which should meet the following requirements:0.02D ⁇ L, L' ⁇ 0.15D, 0.003D ⁇ L1, and L1' ⁇ 0.01D.
  • a maximum circumferential twisting angle ⁇ of spirally rotating the recess 3 and the protrusion 4 around the central axis 24 should meet the following requirement: 70° ⁇ 130°.
  • ⁇ 100°.
  • the distance R' from the projection line of the outer peripheral surface 13 to the central axis 24 has a minimum value (the interference amount is maximum when the outer peripheral surface has a minimum radius).
  • the distance R' from the projection line of the outer peripheral surface 13 to the central axis 24 has the minimum value.
  • the distance from the projection line of the outer peripheral surface 13 to the central axis 24 is constant, while the distance R from the projection line of the inner peripheral surface 23 to the central axis 24 is a variation, which aims to reduce the manufacturing difficulty.
  • the distance from the projection line of the inner peripheral surface 23 to the central axis 24 can be constant, the distance R' from the projection line of the outer peripheral surface 13 to the central axis 24 changes linearly with the increase of the twisting angle in the process of twisting the recess 3 of the cutting part 1 into the protrusion 4 of the clamping part, and the variation is ⁇ R' and should meet the following requirement: 0 ⁇ R' ⁇ 0.04mm.
  • the distance from the projection line of the outer peripheral surface 13 of the cutting part 1 to the central axis 24 and the distance from the projection line of the inner peripheral surface 23 of the clamping part 2 to the central axis 24 can be designed to be varying to ensure the interference amount.
  • each cutting part 1 is provided with two cutting edges.
  • the invention is not limited to this. According to different applications and different working parameters, a single cutting part 1 can be provided with three or more cutting edges.
  • the distance from the outer peripheral surface 13 on the connecting portion 12 of the cutting part 1 to the central axis 24 is R'.
  • the variations ⁇ R and ⁇ R' change linearly with the increase of the twisting angle.
  • the present invention is not limited to this.
  • the variations ⁇ R and ⁇ R' can also be designed as quadratic curves and other changes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
EP19880451.0A 2018-11-02 2019-09-30 Outil d'usinage et de perçage à serrage stable Pending EP3822010A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201811301440.5A CN109262027B (zh) 2018-11-02 2018-11-02 一种夹持稳定的钻削加工刀具
PCT/CN2019/109463 WO2020088190A1 (fr) 2018-11-02 2019-09-30 Outil d'usinage et de perçage à serrage stable

Publications (2)

Publication Number Publication Date
EP3822010A1 true EP3822010A1 (fr) 2021-05-19
EP3822010A4 EP3822010A4 (fr) 2022-03-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880451.0A Pending EP3822010A4 (fr) 2018-11-02 2019-09-30 Outil d'usinage et de perçage à serrage stable

Country Status (4)

Country Link
US (1) US20210299760A1 (fr)
EP (1) EP3822010A4 (fr)
CN (1) CN109262027B (fr)
WO (1) WO2020088190A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109262027B (zh) * 2018-11-02 2020-04-28 株洲钻石切削刀具股份有限公司 一种夹持稳定的钻削加工刀具
CN111054951B (zh) * 2019-12-06 2021-10-12 株洲钻石切削刀具股份有限公司 一种分体式旋转加工刀具
CN112388035B (zh) * 2020-11-05 2022-07-01 成都工具研究所有限公司 一种模块化旋转工具及其安装方法
CN113953565B (zh) * 2021-11-11 2023-06-27 株洲钻石切削刀具股份有限公司 一种钻削加工刀具
CN113953564A (zh) * 2021-11-11 2022-01-21 株洲钻石切削刀具股份有限公司 一种分体式钻削加工刀具
CN117139699A (zh) * 2023-09-26 2023-12-01 株洲钻石切削刀具股份有限公司 一种径向夹持稳定的钻削刀具

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EP1200222B1 (fr) * 1999-08-03 2003-04-02 Kennametal Inc. Foret a tete de coupe remplacable
DE202011050277U1 (de) * 2011-05-30 2012-07-04 Gerhard Bockholt Bohrwerkzeug
CN102847992B (zh) * 2012-09-21 2015-07-29 株洲钻石切削刀具股份有限公司 一种钻削加工刀具
CN202763145U (zh) * 2012-09-21 2013-03-06 株洲钻石切削刀具股份有限公司 一种钻削加工刀具
CN104338974B (zh) * 2014-10-27 2017-10-27 株洲钻石切削刀具股份有限公司 一种可重复装卸的旋转刀具
CN105537654B (zh) * 2015-12-30 2017-09-29 株洲钻石切削刀具股份有限公司 一种钻削加工刀具
CN207431343U (zh) * 2017-10-20 2018-06-01 昆明理工大学 一种自夹紧硬质合金冠齿钻
CN109262027B (zh) * 2018-11-02 2020-04-28 株洲钻石切削刀具股份有限公司 一种夹持稳定的钻削加工刀具
CN109262026B (zh) * 2018-11-02 2019-08-09 株洲钻石切削刀具股份有限公司 一种轴向定位准确的钻削加工刀具

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Publication number Publication date
WO2020088190A1 (fr) 2020-05-07
US20210299760A1 (en) 2021-09-30
CN109262027A (zh) 2019-01-25
CN109262027B (zh) 2020-04-28
EP3822010A4 (fr) 2022-03-23

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